Light-weight back door inner plate assembly

Abstract

The light-weight back door inner plate assembly comprises a back door inner plate and a reinforcing piece fixedly arranged on the back door inner plate, the reinforcing piece is provided with an opening part which is closed in the circumferential direction and used for limiting a back door window area, and the back door inner plate is provided with a reserved hole opposite to the opening part; according to the light-weight back door inner plate assembly provided by the utility model, the cracking risk of a window frame area of the back door inner plate can be effectively reduced, so that the service life of the back door inner plate is prolonged; and meanwhile, the production takt of the back door inner plate assembly and the size precision control of a window frame area can be improved.

Description

Lightweight tailgate inner panel assembly Technical Field

[0001] This utility model relates to the automotive field, specifically to a lightweight tailgate inner panel assembly. Background Technology

[0002] Traditionally, the window frame and inner panel of a car's tailgate are formed from a single piece of steel, resulting in a relatively heavy overall weight. To improve the vehicle's lightweight design, some models use lightweight tailgate panels made of aluminum alloy or other lightweight metals instead of traditional steel panels. However, aluminum alloy tailgate panels have poor overall stamping performance, making it difficult to guarantee the forming quality of the window frame area with its deep drawing depth. Furthermore, the strength of aluminum alloy is lower than that of steel, leading to cracking near the window frame area during use due to insufficient strength, thus reducing the tailgate panel's lifespan. Previously, the strength of the tailgate inner panel was generally improved by placing reinforcing plates at multiple locations in the window frame area. However, this method, due to the dispersed nature of the reinforcing components, has limited effectiveness in improving the strength of the window frame area; it is also significantly affected by the machining precision and cumulative assembly errors of the tailgate inner panel, hindering dimensional accuracy control of the window frame area; additionally, it increases pre-welding and mounting time, which is detrimental to improving production cycle time.

[0003] Therefore, how to improve the service life of lightweight back door inner panels and facilitate the production cycle of inner panel assemblies and the dimensional accuracy control of the window frame area have become technical problems that need to be solved. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a new lightweight back door inner panel assembly, which can effectively reduce the risk of cracking in the window frame area of ​​the back door inner panel, thereby improving the service life of the lightweight back door inner panel; at the same time, it can help improve the production cycle of the back door inner panel assembly and the dimensional accuracy control of the window frame area.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a lightweight rear door inner panel assembly, comprising a rear door inner panel and a reinforcing member fixed to the rear door inner panel, wherein the reinforcing member is provided with a circumferentially closed opening for defining the rear door window area, and the rear door inner panel is provided with a reserved hole opposite to the opening.

[0006] Furthermore, the reinforcing member is composed of multiple reinforcing plates that are connected and fixed end to end in sequence.

[0007] Furthermore, the reinforcing member includes an upper reinforcing plate for the back door window frame, a left hinge reinforcing plate for the back door, a left support rod reinforcing plate for the back door, a lower reinforcing plate for the back door window frame, a right support rod reinforcing plate for the back door, and a right hinge reinforcing plate for the back door, which are sequentially overlapped and fixed together.

[0008] Furthermore, a rear door wiper reinforcement plate is fixedly installed at the horizontal center of the upper reinforcement plate of the rear door window frame.

[0009] Furthermore, the lower reinforcing plate of the back door window frame is provided with a groove that extends along its own length and is used to form a reinforcing cavity after being assembled with the outer panel of the back door.

[0010] Furthermore, at least one outer panel connecting plate for connecting with the outer panel of the back door is fixed on the side of the lower reinforcing plate of the back door window frame near the outer panel of the back door, and the outer panel connecting plate spans both ends of the groove in the width direction of the groove.

[0011] Furthermore, the two ends of the lower reinforcing plate of the back door window frame are respectively overlapped and fixed to the inner panel of the back door, the left support rod reinforcing plate of the back door overlaps and is fixed to the corresponding end of the lower reinforcing plate of the back door window frame and overlaps and is fixed to the inner panel of the back door, and the right support rod reinforcing plate of the back door overlaps and is fixed to the corresponding end of the lower reinforcing plate of the back door window frame and overlaps and is fixed to the inner panel of the back door.

[0012] Furthermore, the horizontal ends of the reinforcing plate under the back door window frame are respectively provided with a left overlapping bracket and a right overlapping bracket, which are respectively overlapped and fixed to the inner panel of the back door.

[0013] Furthermore, a left hinge mounting nut plate is fixedly provided on the left hinge reinforcement plate of the tailgate, a left support rod mounting nut plate is fixedly provided on the left support rod reinforcement plate of the tailgate, a right hinge mounting nut plate is fixedly provided on the right hinge reinforcement plate of the tailgate, and a right support rod mounting nut plate is fixedly provided on the right support rod reinforcement plate of the tailgate.

[0014] Furthermore, the edge of the reserved hole is provided with an overlapping flange for the reinforcement to overlap.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] The lightweight back door inner panel assembly provided by this utility model can effectively reduce the risk of cracking in the window frame area of ​​the back door inner panel, thereby improving the service life of the back door inner panel; at the same time, it can help improve the production cycle of the back door inner panel assembly and the dimensional accuracy control of the window frame area. Specifically, in the structure of this back door inner panel assembly, the back door window area is defined by an opening with a circumferentially closed structure set on the reinforcing member. The reinforcing member can be manufactured independently, which helps to ensure that the window frame area has good forming quality. Moreover, because the reinforcing member is circumferentially closed, it has good bending and torsional stiffness, which is conducive to force transmission and reduces stress concentration. This can effectively reduce the risk of cracking in the window frame area of ​​the back door inner panel and improve the service life of the back door inner panel. At the same time, the reinforcing member can be fixed to the back door inner panel as a whole, which effectively reduces the pre-welding and mounting time and helps to improve the production cycle. Meanwhile, the dimensional accuracy of the window frame area mainly depends on the manufacturing accuracy of the reinforcing member itself, and is relatively less affected by the processing accuracy of the back door inner panel and the cumulative assembly error, which helps to improve the dimensional accuracy control of the window frame area.

[0017] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0018] Figure 1 is a schematic front view of an embodiment of the present invention;

[0019] Figure 2 is a front view structural schematic diagram of a reinforcing member according to an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the main view structure of the inner panel of the back door according to an embodiment of the present invention;

[0021] Figure 4 is an exploded structural diagram of the reinforcing member according to an embodiment of the present invention;

[0022] Figure 5 is a cross-sectional structural diagram of the present invention at position AA in Figure 1 when the back door outer panel is assembled in one embodiment.

[0023] Reference numerals: 1-Inner panel of the rear door; 1a-Pre-drilled hole; 1b-Overlapping flange; 2-Reinforcing member; 2a-Opening; 201-Upper reinforcing plate of the rear door window frame; 201a-Reinforcing plate of the rear door wiper; 202-Reinforcing plate of the left hinge of the rear door; 202a-Left hinge mounting nut plate; 203-Reinforcing plate of the left support rod of the rear door; 203a-Left support rod mounting nut plate; 204-Lower reinforcing plate of the rear door window frame; 204a-Groove; 204b-Outer panel connecting plate; 2041-Left overlapping bracket; 2042-Right overlapping bracket; 205-Reinforcing plate of the right support rod of the rear door; 205a-Right support rod mounting nut plate; 206-Reinforcing plate of the right hinge of the rear door; 206a-Right hinge mounting nut plate; 3-Outer panel of the rear door. Detailed Implementation

[0024] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only for illustrating the basic concept of this utility model. Unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0025] Please refer to Figures 1-5. This embodiment discloses a lightweight tailgate inner panel assembly, including a tailgate inner panel 1 and a reinforcing member 2 fixed to the tailgate inner panel 1. The reinforcing member 2 has a circumferentially closed opening 2a that defines the tailgate window area. The tailgate inner panel 1 has a reserved hole 1a opposite to the opening 2a. Here, both the tailgate inner panel 1 and the reinforcing member 2 are made of aluminum alloy to ensure the overall lightweight design of the tailgate inner panel assembly. The reinforcing member 2 is formed by integral molding or splicing multiple reinforcing plates to form a closed structure with the opening 2a. It can be understood that the edge of the opening 2a defines the tailgate window area. The opening 2a is adapted to the tailgate window shape of a specific vehicle model. It can be understood that the purpose of providing the reserved hole 1a opposite to the opening 2a on the tailgate inner panel 1 is to avoid the tailgate inner panel 1 from obstructing the opening 2a, that is, the size of the reserved hole 1a is larger than the size of the opening 2a. In this embodiment, the reinforcing member 2 and the inner panel 1 of the back door are positioned face-to-face at the reserved hole 1a and fixed by overlapping. The lightweight inner panel assembly of the back door in the above structure can effectively reduce the risk of cracking in the window frame area of ​​the inner panel, thereby improving the service life of the inner panel 1; at the same time, it can help improve the production cycle of the inner panel assembly and the dimensional accuracy control of the window frame area. Specifically, in this lightweight back door inner panel assembly structure, the back door window area is defined by the opening 2a with a circumferentially closed structure set on the reinforcing member 2. The reinforcing member 2 can be manufactured independently, which helps to ensure that the window frame area has good forming quality. Moreover, since the reinforcing member 2 is circumferentially closed, it has good bending and torsional stiffness, which is conducive to force transmission and reduces stress concentration. This can effectively reduce the risk of cracking in the window frame area of ​​the back door inner panel and improve the service life of the back door inner panel 1. At the same time, the reinforcing member 2 can be fixed to the back door inner panel 1 as a whole, which effectively reduces the pre-welding and mounting time and helps to improve the production cycle. Meanwhile, the dimensional accuracy of the window frame area mainly depends on the manufacturing accuracy of the reinforcing member 2 itself, and is relatively less affected by the processing accuracy of the back door inner panel 1 and the cumulative assembly error, which helps to improve the dimensional accuracy control of the window frame area. Furthermore, since the opening 2a of the reinforcing member 2 defines the back door window area, it is beneficial to reduce the forming accuracy requirements of the reserved hole 1a, which in turn is beneficial to reduce the stamping accuracy requirements of the back door inner panel 1, reduce the processing difficulty, and reduce the manufacturing cost.

[0026] In this embodiment, the reinforcing member 2 is composed of multiple reinforcing plates connected and fixed end to end in sequence. Using multiple reinforcing plates connected and fixed end to end in sequence facilitates the formation of a closed-loop structure with an opening 2a. Adjacent reinforcing plates are fixed to each other using lap welding or butt welding. Each reinforcing plate can be individually stamped and formed before being connected. By using the structure of multiple reinforcing plates connected and fixed end to end in sequence, the reinforcing member 2 can be further disassembled, which helps reduce the processing difficulty of stamping and forming the reinforcing member, and helps ensure the processing quality and precision of each component; in addition, it also helps reduce material usage and control costs.

[0027] In this embodiment, the reinforcing member 2 includes a rear door window frame upper reinforcing plate 201, a rear door left hinge reinforcing plate 202, a rear door left support rod reinforcing plate 203, a rear door window frame lower reinforcing plate 204, a rear door right support rod reinforcing plate 205, and a rear door right hinge reinforcing plate 206, which are sequentially overlapped and fixed end to end. The reinforcing plates are fixed by welding overlap, resulting in good connection strength. The "left" and "right" mentioned here correspond to the left and right sides of the vehicle body width. The reinforcing member in this structural design simultaneously serves as a window frame reinforcement, a rear door hinge reinforcement, and a rear door support rod mounting point reinforcement, providing multiple functions. For the aluminum alloy rear door inner panel, this reduces the need for separate additional rear door hinge reinforcing plates and rear door support rod reinforcing plates, thereby further improving the assembly efficiency of the rear door assembly and facilitating the overall dimensional accuracy control of the rear door assembly.

[0028] In this embodiment, a rear door wiper reinforcement plate 201a is fixedly installed at the middle of the horizontal direction of the upper reinforcement plate 201 of the rear door window frame. Here, "horizontal" corresponds to the horizontal direction of the vehicle, i.e., the width direction of the vehicle body. Specifically, the rear door wiper reinforcement plate 201a is welded and fixed to the upper reinforcement plate 201 of the rear door window frame. Integrating the rear door wiper reinforcement plate 201a onto the upper reinforcement plate 201 of the rear door window frame improves the structural strength of the rear door wiper mounting point; simultaneously, it further enhances the structural strength of the upper reinforcement plate 201 of the rear door window frame at the mounting location of the rear door wiper reinforcement plate 201a; furthermore, the rear door wiper reinforcement plate 201a can be assembled with the reinforcement member 2 as a whole with the inner panel 1 of the rear door, which further improves the assembly efficiency of the rear door assembly and increases production cycle time.

[0029] In this embodiment, the lower reinforcing plate 204 of the tailgate window frame is provided with a groove 204a extending along its own length direction and used to form a reinforcing cavity after assembly with the outer tailgate panel 3. Specifically, the length direction of the lower reinforcing plate 204 of the tailgate window frame is consistent with the lateral direction of the vehicle body. It can be understood that the groove 204a is recessed towards the side away from the outer tailgate panel 3. By providing the groove 204a that can form a reinforcing cavity after assembly with the outer tailgate panel 3, it is beneficial to improve the reinforcing effect on the middle part of the outer tailgate panel 3, thereby improving the bending stiffness and bending mode of the tailgate assembly.

[0030] In this embodiment, at least one outer panel connecting plate 204b for connecting with the outer panel 3 is fixed on the side of the lower reinforcing plate 204 of the rear door window frame near the outer panel 3, and the outer panel connecting plate 204b spans both ends of the groove 204a in the width direction of the groove 204a. Specifically, there are two outer panel connecting plates 204b, but other numbers can be used in other embodiments. After crossing the groove 204a, both ends of the outer panel connecting plate 204b are welded and lapped to the lower reinforcing plate 204 of the rear door window frame, and spot-welded to the outer panel 3 during final assembly. The outer panel connecting plate 204b helps to further enhance the bending stiffness and bending mode of the lower reinforcing plate 204 of the rear door window frame, thereby improving the service durability of the window frame area; at the same time, it can also enhance the connection reliability between the lower reinforcing plate 204 of the rear door window frame and the outer panel 3 of the rear door. In addition, the material usage is small, which helps to ensure the lightweight design of the whole vehicle.

[0031] In this embodiment, the two lateral ends of the lower reinforcing plate 204 of the back door window frame are respectively overlapped and fixed to the inner panel 1 of the back door. The left support rod reinforcing plate 203 of the back door overlaps and is fixed to the corresponding end of the lower reinforcing plate 204 of the back door window frame and also overlaps and is fixed to the inner panel 1 of the back door. The right support rod reinforcing plate 205 of the back door overlaps and is fixed to the corresponding end of the lower reinforcing plate 204 of the back door window frame and also overlaps and is fixed to the inner panel 1 of the back door. All overlapping and fixing mentioned here are welded overlapping and fixing. In this structural design, by connecting the lower reinforcing plate 204 of the back door window frame to the left support rod reinforcing plate 203, the right support rod reinforcing plate 205, and the inner panel 1 of the back door simultaneously, the structural strength of the lower corner area of ​​the window frame is enhanced, thereby improving the reliability of use.

[0032] In this embodiment, the lower reinforcing plate 204 of the back door frame is provided with a left overlapping bracket 2041 and a right overlapping bracket 2042 at its two transverse ends, respectively. The left overlapping bracket 2041 and the right overlapping bracket 2042 are respectively overlapped and fixed to the inner panel 1 of the back door. Specifically, the left overlapping bracket 2041 and the right overlapping bracket 2042 are integrally formed with the lower reinforcing plate 204 of the back door frame. The left overlapping bracket 2041 and the right overlapping bracket 2042 are arranged in a V-shape. An overlapping flange 1b is provided at the edge of the reserved hole 1a in the inner panel 1 of the back door, and the left overlapping bracket 2041 and the right overlapping bracket 2042 are respectively overlapped and fixed on the overlapping flange 1b. By setting the left overlapping bracket 2041 and the right overlapping bracket 2042, it is beneficial to reduce the amount of overlap with the inner panel 1 of the tailgate, reduce the manufacturing precision requirements of the corresponding overlapping surface on the inner panel of the tailgate, and thus further reduce the overall processing cost of the tailgate inner panel assembly.

[0033] In this embodiment, a left hinge mounting nut plate 202a is fixedly mounted on the left hinge reinforcement plate 202 of the rear door, a left support rod mounting nut plate 203a is fixedly mounted on the left support rod reinforcement plate 203 of the rear door, a right hinge mounting nut plate 206a is fixedly mounted on the right hinge reinforcement plate 206 of the rear door, and a right support rod mounting nut plate 205a is fixedly mounted on the right support rod reinforcement plate 205 of the rear door. Each mounting nut plate is welded and fixed to its corresponding reinforcement plate. By separating the mounting components of the rear door hinge and rear door support rod into corresponding individual mounting nut plates, it is easier to adjust the position of their respective mounting points, improving assembly feasibility.

[0034] In this embodiment, the edge of the reserved hole 1a is provided with an overlapping flange 1b for the reinforcement 2 to overlap. Specifically, to facilitate die cutting, the tailgate inner panel 1 adopts a flange structure with the same angle around the reserved hole 1a. By setting the overlapping flange 1b, the connection reliability and assembly convenience of the reinforcement 2 are improved. In this embodiment, the reinforcement 2 and the tailgate inner panel 1 are overlapped and fixed along the length of the vehicle body. In this embodiment, a concave rib or / and convex rib structure integral with the tailgate inner panel 1 is also provided in the area below the reserved hole 1a on the tailgate inner panel 1 to reinforce the lower area of ​​the tailgate inner panel 1, distribute and guide the force on the tailgate to the tailgate lock position, and improve the rigidity of the tailgate.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A lightweight rear door inner panel assembly, characterized in that: It includes a rear door inner panel (1) and a reinforcing member (2) fixed on the rear door inner panel (1). The reinforcing member (2) is provided with a circumferentially closed opening (2a) to define the rear door window area. The rear door inner panel (1) is provided with a reserved hole (1a) opposite to the opening (2a).

2. The lightweight rear door inner panel assembly according to claim 1, characterized in that: The reinforcing member (2) is composed of multiple reinforcing plates that are connected and fixed end to end in sequence.

3. The lightweight rear door inner panel assembly according to claim 1, characterized in that: The reinforcing member (2) includes an upper reinforcing plate (201) for the back door window frame, a left hinge reinforcing plate (202) for the back door, a left support rod reinforcing plate (203) for the back door, a lower reinforcing plate (204) for the back door window frame, a right support rod reinforcing plate (205) for the back door, and a right hinge reinforcing plate (206) for the back door, which are fixed together in sequence.

4. The lightweight tailgate inner panel assembly of claim 3, wherein: A rear door wiper reinforcement plate (201a) is fixed at the middle of the horizontal direction of the upper reinforcement plate (201) of the rear door window frame.

5. The lightweight back door inner panel assembly of claim 3, wherein: The lower reinforcing plate (204) of the back door window frame is provided with a groove (204a) that extends along its own length and is used to form a reinforcing cavity after being assembled with the outer panel of the back door.

6. The lightweight back door inner panel assembly of claim 5, wherein: At least one outer panel connecting plate (204b) for connecting with the outer panel of the back door is fixed on the side of the reinforcing plate (204) below the back door window frame, and the outer panel connecting plate (204b) spans both ends of the groove (204a) in the width direction of the groove (204a).

7. The lightweight back door inner panel assembly of claim 3, wherein: The two ends of the lower reinforcing plate (204) of the back door window frame are respectively connected and fixed to the inner panel (1) of the back door. The left support rod reinforcing plate (203) of the back door is connected and fixed to the corresponding end of the lower reinforcing plate (204) of the back door window frame and is also connected and fixed to the inner panel (1) of the back door. The right support rod reinforcing plate (205) of the back door is connected and fixed to the corresponding end of the lower reinforcing plate (204) of the back door window frame and is also connected and fixed to the inner panel (1) of the back door.

8. The lightweight back door inner panel assembly of claim 7, wherein: The lower reinforcing plate (204) of the back door window frame is provided with a left overlapping bracket (2041) and a right overlapping bracket (2042) at its two horizontal ends respectively. The left overlapping bracket (2041) and the right overlapping bracket (2042) are respectively overlapped and fixed to the inner panel (1) of the back door.

9. The lightweight back door inner panel assembly of claim 3, wherein: A left hinge mounting nut plate (202a) is fixed on the left hinge reinforcement plate (202) of the rear door, a left support rod mounting nut plate (203a) is fixed on the left support rod reinforcement plate (203), a right hinge mounting nut plate (206a) is fixed on the right hinge reinforcement plate (206) of the rear door, and a right support rod mounting nut plate (205a) is fixed on the right support rod reinforcement plate (205).

10. The lightweight back door inner panel assembly of claim 1, wherein: The edge of the reserved hole (1a) is provided with an overlapping flange (1b) for the reinforcement (2) to overlap.

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